Does PIX 7.0 support the Are You There (AYT) feature?
A. Yes. In an AYT scenario, a remote user has a personal firewall installed on the PC. The VPN Client enforces the firewall policy defined on the local firewall, and it monitors that firewall to make sure that is runs. If the firewall stops running, the VPN Client drops the connection to the PIX or ASA. This firewall enforcement mechanism is called Are You There (AYT), because the VPN Client monitors the firewall by sending it periodic "are you there?" messages. If no reply comes, the VPN Client knows the firewall is down and terminates its connection to the PIX Security Appliance. The network administrator might configure these PC firewalls originally, but with this approach, users can customize their own configurations.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...